US6512542B1 - TV lens drive unit having a mechanism for designating a constant zoom rate - Google Patents

TV lens drive unit having a mechanism for designating a constant zoom rate Download PDF

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Publication number
US6512542B1
US6512542B1 US09/161,437 US16143798A US6512542B1 US 6512542 B1 US6512542 B1 US 6512542B1 US 16143798 A US16143798 A US 16143798A US 6512542 B1 US6512542 B1 US 6512542B1
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Prior art keywords
zoom
switch
rate
constant
drive unit
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Expired - Lifetime
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US09/161,437
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English (en)
Inventor
Keiji Kaneko
Hisao Takemae
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Fujinon Corp
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Fuji Photo Optical Co Ltd
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Assigned to FUJI PHOTO OPTICAL CO., LTD. reassignment FUJI PHOTO OPTICAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANEKO, KEIJI, TAKEMAE, HISAO
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer

Definitions

  • the present invention relates generally to a TV lens drive unit, and more particularly to a TV lens drive unit which controls the zooming of a zoom lens used in an ENG camera, etc.
  • a lens drive unit is attached to the side of a lens barrel, and a rotational driving force of a motor, which is arranged in the drive unit, drives a focus ring, a zoom ring, and an iris ring in the lens barrel to adjust a zoom, a focus and an iris, respectively.
  • the lens drive unit performs the zooming with a zoom seesaw control switch (hereinafter referred to as a seesaw switch) and a zoom rate demand unit.
  • the zoom rate can be adjusted in accordance with the operated amount of the seesaw switch and a thumb ring of the zoom rate demand unit.
  • the present invention has been developed in view of the above-described circumstances, and has as its object the provision of a TV lens drive unit which is able to control the zooming at a constant rate by a simple operation and reduce the difficulties during the operation.
  • a TV lens drive unit which moves a variable frame lens group of a TV lens with a motor to thereby adjust a zoom
  • the TV lens drive unit comprising: zoom control means for designating a telephoto/wide zoom direction and a zoom rate; storage means for storing the zoom direction and the zoom rate, designated by the zoom control means when switch means is operated, in response to the operation of the switch means during the operation of the zoom control means; and motor control means for invalidating the zoom direction and the zoom rate designated by the zoom control means in response to the operation of the switch means during the operation of the zoom control means, and running the motor so that the zoom rate can be constant in accordance with the designation of the zoom direction and the zoom rate stored in the storage means.
  • the switch means if the switch means is operated when the zoom control means control the zooming by designating the zoom direction and zoom rate, the designated zoom direction and zoom rate when the switch means is operated are stored in the storage means. Then, a command from the zoom control means is invalidated, and the zooming continues at the stored zoom rate in the stored direction. It is therefore possible to easily maintain the zoom rate constant by operating switch means during the operation of the zoom control means.
  • the above-described TV lens drive unit is provided with a detection means which detects that the zoom position is close to the telephoto end or the wide end, and a reducing means which reduces the zoom rate in proximity to the telephoto end or the wide end in accordance with the detection of the detection means. It is therefore possible to prevent a sudden stop at the telephoto end or the wide end, and the lens can stop naturally at the zoom end.
  • control member of the switch means may also serve as a control member of a switch means relating to another function such as a return switch.
  • FIG. 1 is a perspective view illustrating the appearance of the TV lens to which the present invention is applied;
  • FIG. 2 is a circuit diagram showing an example of the TV lens drive unit
  • FIG. 3 is a flow chart showing the flow of zooming
  • FIG. 4 is a circuit diagram showing another example of the TV lens drive unit
  • FIG. 5 is a circuit diagram showing an example of the structure when the TV lens drive unit according to the present invention is applied to a zoom rate demand unit;
  • FIG. 6 is a circuit diagram showing another example of the structure when the TV lens drive unit according to the present invention is applied to a zoom rate demand unit;
  • FIG. 7 is a view showing the structure of the TV lens drive unit according to the second embodiment of the present invention.
  • FIG. 8 is a flow chart showing the flow of the zooming performed by the TV lens drive unit in FIG. 7;
  • FIG. 9 is a view showing the structure of the TV lens drive unit according to the third embodiment of the present invention.
  • FIG. 1 is a perspective view illustrating the appearance of a TV lens to which the present invention is applied.
  • the TV lens 1 is a zoom lens for use in an ENG camera, etc.
  • a focus ring 4 , a zoom ring 6 and an iris ring 8 are formed in a lens barrel 2 .
  • a drive unit 10 is attached to the side of the lens barrel 2 , and the drive unit 10 drives the focus ring 4 , the zoom ring 6 and the iris ring 8 .
  • the inner structure of the lens barrel 2 is not illustrated, but as is well known, a focus lens group, a variable frame lens group, an iris, a relay lens, etc. are arranged in the lens barrel.
  • Rotating the focus ring 4 moves the focus lens group forward and backward along an optical axis to adjust a focus.
  • Rotating the zoom ring 6 moves the variable frame lens group forward and backward along the optical axis to adjust a zoom.
  • Rotating the iris ring 8 adjusts the diameter of an iris diaphragm.
  • the drive unit 10 has a case 12 , which is fixed to the side of the lens barrel 2 with screws 14 , 14 .
  • a focus drive motor (not illustrated) is arranged in the case 12 , and the rotational driving force of the focus drive motor is transmitted to the focus ring 4 through a gear transmission mechanism (not illustrated) to rotate the focus ring 4 .
  • a zoom drive motor (not illustrated in FIG. 1) is arranged in the case 12 , and the rotational driving force of the zoom drive motor is transmitted to the zoom ring 6 through a gear transmission mechanism (not illustrated) to rotate the zoom ring 6 .
  • an iris drive motor (not illustrated) is arranged in the case 12 to rotate the iris ring 8 .
  • a zoom seesaw control switch (a seesaw switch) 16 , an iris auto/manual mode changeover switch 18 , an iris momentary switch 20 , a return switch 22 , etc. are provided at the top of the case 12 .
  • the seesaw switch 16 is capable of swinging with the neutral position being the basis. If the seesaw switch 16 is operated to a telephoto (T) side or a wide (W) side, the zoom ring 6 is rotated to the telephoto side or the wide side.
  • the pressed amount (the operated amount) of the seesaw switch 16 adjusts the zoom rate. The larger the pressed amount is, the higher the zoom rate is.
  • a grip band 24 is attached to the side of the case 12 , and the cameraman inserts four fingers (other than the thumb) of the right hand into the grip band 24 to hold the lens barrel 2 .
  • a VTR switch 26 and a constant zoom rate control start switch (hereinafter referred to as a constant switch) 28 are arranged on the back surface of the case 12 (see FIG. 2 ), and the cameraman can operate the switches 26 , 28 with the thumb of the right hand.
  • the VTR switch 26 is a push button which is operated to start and finish recording when an image being captured is recorded on video tape.
  • the constant rate switch 28 is also a push button. Pressing the constant rate switch 28 during the operation of the seesaw switch 16 keeps a zoom rate constant. The zoom rate is indicated by the operated amount of the seesaw switch 16 when the constant switch 28 is operated.
  • Reference numeral 30 is a maximum zoom rate control, and rotating the control 30 sets the zoom rate (the maximum zoom rate).
  • the zoom rate the maximum zoom rate
  • the seesaw switch 16 is pressed the deepest, the zooming is performed at the maximum zoom rate.
  • the more the maximum zoom rate control 30 is rotated clockwise in the drawing the higher the maximum zoom rate is.
  • FIG. 2 shows an example of the circuit in the drive unit for the TV lens 1 .
  • reference numeral 32 is a zoom drive motor
  • 34 is a potentiometer corresponding to the seesaw switch 16 in FIG. 1
  • 36 is a potentiometer which is equivalent to a zoom position detector for detecting the position of the variable frame lens group (a zoom position)
  • 38 is a switch means (hereinafter referred to as a switch SW 1 ) which is equivalent to the constant rate switch 28 in FIG. 1 .
  • the output of the potentiometer 34 in the seesaw switch 16 is transmitted to an input terminal of an operational amplifier 42 via a resistance R 1 and a relay 40 (hereinafter referred to as a switch SW 2 ).
  • the operational amplifier 42 which is simplified in the drawing, generates a motor drive signal which realizes a zoom rate conforming to the operated amount of the seesaw switch 16 in accordance with the maximum rate set by the maximum zoom rate control 30 .
  • the motor drive signal is added to the zoom drive motor 32 through a power amplifier 44 .
  • the zooming is performed at the zoom rate conforming to the operated amount of the seesaw switch 16 with the set maximum rate being the upper limit.
  • the input terminal of the operational amplifier 42 connects to one terminal of the condenser C 1 , and a common voltage terminal connects to the other terminal of the condenser C 1 .
  • the switch SW 2 (a contact of a normally closed circuit) is ON, an output voltage (a zoom rate designation voltage) of the potentiometer 34 is charged in the condenser C 1 .
  • pressing (ON) the switch SW 1 turns off the switch SW 2 to store the zoom rate designation voltage in the condenser C 1 .
  • the potentiometer 34 outputs the zoom rate designation voltage. Consequently, the zoom rate designation voltage when the switch SW 1 is turned on is input to the operational amplifier 42 , keeping the zoom rate constant.
  • a potentiometer 36 regularly detects the zoom position, and an output signal (a zoom position detection signal) of the potentiometer 36 is transmitted to a zoom end detection circuit 46 , which is simplified in the drawing.
  • the zoom end detection circuit 46 detects whether the taking lens has reached the telephoto or wide end (hereinafter referred to as the zoom end) or not, and outputs a signal in accordance with the detection results.
  • the output signal of the zoom end detection circuit 46 is transmitted to a relay 48 (hereinafter referred to as a switch SW 3 ) through a diode D 1 to open and close a contact of the switch SW 3 (a contact of the normally open circuit).
  • One terminal 48 A of the switch SW 3 as well as the terminal of the condenser C 1 connects to an input terminal of the operational amplifier 42 , and the other terminal of the switch SW 3 connects to a common voltage terminal.
  • the zoom end detection circuit 46 outputs a detection circuit indicating that it has detected the zoom end
  • the switch SW 3 is turned on and the operational amplifier 42 outputs a motor stop signal to stop the zoom drive motor 32 .
  • the output signal of the zoom end detection circuit 46 is transmitted to a clear terminal (CR) of an input-output circuit (e.g., an up counter) 50 .
  • An input terminal (CK) of the input-output circuit 50 connects to a voltage terminal 52 via the switch SW 1 , and an output signal of the input-output circuit 50 is transmitted to the switch SW 2 and a canceling circuit 54 .
  • the input-output circuit 50 outputs a signal from an output terminal (Q) thereof to turn off the contact of the switch SW 2 when a pulse is input from the input terminal (CK).
  • the cancel circuit 54 which is simplified in the drawing, detects the change in the output of the potentiometer 34 in the seesaw switch 16 to supply a reset signal to the input-output circuit 50 .
  • the switch SW 2 is closed to cancel the zooming at the constant rate (the constant rate zooming).
  • the switch SW 1 in FIG. 2 is OFF, the switch SW 2 is ON, and the switch SW 3 is OFF. If the seesaw switch 16 is operated in the normal state, the output of the potentiometer 34 in accordance with the operation is transmitted to the operational amplifier 42 to run the zoom drive motor 32 . Specifically, the zooming is performed at the zoom rate conforming to the pressed amount of the seesaw switch 16 with the maximum rate set by the maximum zoom rate control 34 being the upper limit.
  • the potentiometer 36 regularly monitors the zoom position.
  • the zoom end detection circuit 46 detects the zoom end, the switch SW 3 is turned on to invalidate the instruction from the seesaw switch 16 .
  • the operational amplifier 42 outputs a motor stop signal to stop the zoom drive motor 32 .
  • the constant rate action is cancelled in the following three cases.
  • the first case is that the zoom end detection circuit 46 detects the zoom end
  • the second case is that the seesaw switch 16 is operated again during the constant rate zooming
  • the third case is that the switch SW 1 is pressed again during the constant rate zooming.
  • the zoom end detection circuit 46 detects the zoom end during the constant rate zooming, the zoom end detection circuit 46 outputs a detection signal to turn on the switch SW 3 . At this time, the operational amplifier 42 outputs the motor stop signal to stop the zoom drive motor 32 .
  • the cancel circuit 54 detects the change in the output of the potentiometer 34 due to the operation.
  • the cancel circuit 54 outputs a reset signal to the input-output circuit 50 .
  • the switch SW 2 On reception of the reset signal, the switch SW 2 outputs a signal to turn on the switch SW 2 . This causes the output voltage of the potentiometer 34 in the seesaw switch 16 to transmit to the operational amplifier 42 .
  • the zooming is performed at the rate conforming to the operation of the seesaw switch 16 .
  • the input-output circuit 50 outputs a signal to turn on the switch SW 2 to cancel the constant rate zooming.
  • the operation is specified by whether the seesaw switch 16 is operated or not (step S 101 ), and whether the constant rate switch 28 (the switch SW 1 ) is operated or not (step S 102 ).
  • step S 101 if the switch SW 1 is not turned on after the seesaw switch 16 is operated (step S 101 ), the zooming is performed at a rate conforming to the operation of the seesaw switch 16 (step S 104 ). The zooming continues in accordance with the operation of the seesaw switch 16 (steps S 104 -S 110 ) until the zoom end is detected (step S 108 ) or until the operation of the seesaw switch 16 is cancelled (step S 110 ).
  • step S 130 If the zoom end is detected at the step S 108 or if the operation of the seesaw switch 16 is cancelled at the step S 110 , the zooming is completed (step S 130 ).
  • step S 102 if the switch SW 1 is turned on (step S 102 ) after the seesaw switch 16 is operated (step S 101 ), the zooming is performed at the constant rate (step S 120 ).
  • the rate is designated by the seesaw switch 16 when the switch SW 1 is turned on.
  • step S 120 The zooming continues at the constant rate (steps S 120 -S 126 ) until the zoom end is detected (step S 124 ) or until the switch SW 1 or the seesaw switch 16 is operated again (step S 126 ).
  • step S 124 If the zoom end is detected (step S 124 ) or the switch SW 1 or the seesaw switch 16 is operated again (step S 126 ) during the constant rate zooming , the constant rate zooming is cancelled (step S 128 ) and the zooming is completed (step S 130 ). Thereafter, the zooming stops if the zoom end is detected at the step S 124 , and the processing returns to the step S 101 if the switch SW 1 or the seesaw switch 16 is operated again at the step S 126 .
  • the zoom rate can be kept constant only by pressing the constant rate switch 28 during the operation of the seesaw switch 16 . If the seesaw switch 16 is operated again during the constant rate zooming, the constant rate zooming is cancelled so that the operation of the seesaw switch 16 can take priority. Thus, the cameraman can control the zoom as he likes.
  • the timer circuit 60 may be used instead of the zoom end detection circuit 46 in FIG. 2 .
  • FIG. 4 parts similar to those described with reference to FIG. 2 are denoted by the same reference numerals, and they will not be explained.
  • the terminal 38 A of the switch SW 1 connects to the input terminal of the timer circuit 60 , which counts the time since the switch SW 1 is turned on.
  • the time required for the zooming from the telephoto end to the wide end at the minimum zoom rate is set in the timer circuit 60 .
  • the timer circuit 60 outputs a signal to turn on the switch SW 3 .
  • the timer circuit 60 functions in substantially the same manner as the zoom end detection circuit 46 described with reference to FIG. 2 .
  • the timer circuit 60 determines whether a preset time has passed or not, instead of detecting the zoom end.
  • FIG. 5 shows an example wherein the TV lens drive unit of the present invention is applied to a zoom rate demand unit. Parts similar to those described with reference to FIG. 2 are denoted by the same reference numerals, and they will not be explained.
  • the left side of a borderline 62 indicated by a dot-broken line in FIG. 5 is equivalent to the zoom rate demand unit, and the right side thereof is equivalent to the TV lens.
  • the operational amplifier 42 , the power amplifier 44 , the zoom drive motor 32 and a zoom position detector (the potentiometer 36 ) are provided in the TV lens side.
  • the zoom rate demand unit has a thumb ring as the zoom control means, and reference numeral 34 in FIG. 5 is a potentiometer of the thumb ring.
  • the switch SW 1 , the zoom end detection circuit 46 , the input-output circuit 50 , the canceling circuit 54 , the condenser C 1 , etc. are provided in the zoom rate demand unit side, which connects to the TV lens through a cable.
  • the operation of the TV lens drive unit is the same as what was described with reference to FIG. 2, and thus, it will not be explained.
  • the timer circuit 60 may be used instead of the zoom end detection circuit 46 in FIG. 5 .
  • parts similar to those described with reference to FIG. 5 are denoted by the same reference numerals, and they will not be explained.
  • the operation of the structure in FIG. 6 is the same as in the embodiment described with reference to FIG. 4 .
  • the structure in FIG. 6 does not require the potentiometer for detecting the zoom position.
  • FIG. 7 shows the structure of a TV lens drive unit according to the second embodiment of the present invention.
  • parts similar to those described with reference to FIG. 2 are denoted by the same reference numerals, and they will not be explained.
  • a zoom rate reducing circuit 66 is provided at the front of the operational amplifier 42 , and the output of the potentiometer 36 for detecting the zoom position is transmitted to the zoom rate reducing circuit 66 .
  • the zoom rate reducing circuit 66 which is simplified in FIG. 7, detects whether the current zoom position is close to the zoom end or not in accordance with the signal from the potentiometer 36 for detecting the zoom position.
  • the zoom rate reducing circuit 66 outputs a signal to the operational amplifier 42 in such a way as to smoothly reduce the zoom rate in proximity to the zoom end so that the zoom lens can stop at the zoom end.
  • the criteria in deciding whether the zoom position is close to the zoom end or not, a time constant for reduction, and so forth are set appropriately.
  • the zoom rate is reduced automatically in proximity to the telephoto end or the wide end, thus preventing the sudden stop at the zoom end.
  • FIG. 8 shows the flow of the zooming performed by the TV lens drive unit in FIG. 7 .
  • the process of detecting whether the zoom position is close to the zoom end or not (step S 106 ) and the process of reducing the zoom rate (step S 107 ) are added between the step S 104 and the step S 108 in the flow chart of FIG. 3, and the process of detecting whether the zooming position is close to the zoom end or not (step S 122 ) and the process of reducing the zoom rate (step S 123 ) are added between the step S 120 and the step S 124 .
  • the same processes as those in the flow chart of FIG. 3 are denoted by the same reference numerals, and they will not be explained.
  • the zoom rate reducing circuit 66 detects that the zooming position is close to the zoom end (step S 106 ) during the zooming in accordance with the command from the seesaw switch 16 at the step S 104 , the zoom rate reducing circuit 66 reduces the zoom rate in accordance with a preset reducing function (step S 107 ). If the zoom position is not close to the zoom end at the step S 106 , the zoom control continues in accordance with the command from the seesaw switch 16 (steps S 108 , S 110 ).
  • step S 122 If the switch SW 1 is operated during the operation of the seesaw switch 16 (steps S 101 , S 102 ) and the zoom rate reducing circuit 66 detects that the zoom position is close to the zoom end during the constant rate zooming (step S 122 ), the zoom rate reducing circuit 66 reduces the zoom rate in accordance with a preset reducing function (step S 123 ). If the zoom position is not close to the zoom end at the step S 122 , the constant rate zooming at the step S 120 continues (steps S 124 , S 126 ).
  • the zoom rate is reduced smoothly when the lens gets close to the telephoto end and the wide end, so that the lens can stop at the telephoto end and the wide end. It is particularly advantageous if the zooming is performed at a high rate.
  • FIG. 9 shows the structure of a TV lens drive unit according to the third embodiment of the present invention. Parts similar to those described with reference to FIG. 2 are denoted by the same reference numerals, and they will not be explained.
  • the TV lens drive unit uses the switch SW 1 as the return switch (RET SW) 22 , and there is no necessity for providing the constant rate switch 28 in FIG. 1 in view of the appearance of the apparatus.
  • the return switch 22 is provided with the function of the constant rate switch. It is also possible to provide another switch with the function of the constant rate switch.
  • the return switch 22 is operated to project an image, which is captured by another cameraman (e.g., an image on air), on the viewfinder of the TV camera.
  • the return switch 22 is operated appropriately to confirm the image.
  • an input determination circuit 68 is provided behind the switch SW 1 , and the input determination circuit 68 switches the functions relating to whether the switch SW 1 is used as the return switch or the constant rate switch for the constant rate zooming.
  • the input determination circuit 68 receives an output voltage of the potentiometer 34 in the seesaw switch 16 , and receives a detection signal from the zoom end detection circuit 46 . Only when the seesaw switch 16 is operated, the input determination circuit 68 transmits a control signal from the SW 1 to the input-output circuit 50 . If the seesaw switch 16 is not operated, the input determination circuit 68 changes the connection paths for the switch SW 1 so that the control signal from the switch SW 1 can transmit to a return input terminal of a camera circuit (not illustrated).
  • the switch SW 1 functions as the return switch when the seesaw switch 16 is not operated, and it functions as the constant rate switch for the constant rate zooming only when the seesaw switch 16 is operated.
  • the constant rate zooming is cancelled by detecting the zoom end or operating the seesaw switch 16 again.
  • the constant rate switch which is operated to keep the zoom rate constant, is also used as another switch such as the existing return switch, and therefore, it is not necessary to provide a special switch means as the constant rate switch.
  • the timer circuit 60 may be used instead of the zoom end detecting circuit 46 in FIG. 9 .
  • the switch means is operated during the operation of the zoom control means to thereby store the zoom direction and rate and maintain the zoom rate.
  • the zooming is performed at the zoom rate when the switch means is operated. It is therefore easy to keep the zoom rate constant. It is particularly advantageous when the cameraman shoots with the TV camera such as the ENG camera on the shoulder.
  • the cameraman can concentrate his attention on the confirmation of the composition and the circumstantial judgement without being troubled by the zooming operation. This provides more safety for the cameraman while he is moving.
  • the present invention provides the function of reducing the zoom rate in proximity to the telephoto end or the wide end, so that the lens can stop naturally at the telephoto end or the wide end.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)
US09/161,437 1997-09-29 1998-09-28 TV lens drive unit having a mechanism for designating a constant zoom rate Expired - Lifetime US6512542B1 (en)

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JP26407897A JP3880706B2 (ja) 1997-09-29 1997-09-29 テレビレンズの駆動装置
JP9-264078 1997-09-29

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US20040189848A1 (en) * 2003-03-26 2004-09-30 Takeshi Idemura Operation apparatus and device for image-taking
US20100045817A1 (en) * 2008-04-11 2010-02-25 Makoto Saijo Camera control apparatus and camera control method
JP2013050684A (ja) * 2011-08-31 2013-03-14 Fujifilm Corp レンズ駆動装置
US20150286110A1 (en) * 2014-04-04 2015-10-08 Canon Kabushiki Kaisha Lens apparatus and image pickup apparatus including the same
CN110049232A (zh) * 2018-01-15 2019-07-23 佳能株式会社 电子装置、其控制方法和存储介质

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US6285511B1 (en) * 1999-09-07 2001-09-04 Fuji Photo Optical Co., Ltd. Manual and automatic apparatus for lens barrel
JP2001124977A (ja) * 1999-10-28 2001-05-11 Canon Inc 光学装置、光学装置駆動ユニットおよびカメラシステム
US7079182B1 (en) 1999-10-28 2006-07-18 Canon Kabushiki Kaisha Optical apparatus, optical apparatus driving unit and camera system
IT1398836B1 (it) * 2010-03-19 2013-03-21 Selex Galileo Spa Unita' di acquisizione di immagini.
JP5583049B2 (ja) * 2011-02-17 2014-09-03 富士フイルム株式会社 レンズ装置、テレビカメラシステムおよびフォーカシングアシスト方法
JP7309321B2 (ja) * 2018-01-15 2023-07-18 キヤノン株式会社 表示制御装置、その制御方法およびプログラム

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US20150286110A1 (en) * 2014-04-04 2015-10-08 Canon Kabushiki Kaisha Lens apparatus and image pickup apparatus including the same
US9958754B2 (en) * 2014-04-04 2018-05-01 Canon Kabushiki Kaisha Lens apparatus and image pickup apparatus including the same
CN110049232A (zh) * 2018-01-15 2019-07-23 佳能株式会社 电子装置、其控制方法和存储介质
EP3511812A3 (de) * 2018-01-15 2019-08-07 Canon Kabushiki Kaisha Elektronische vorrichtung, verfahren zur steuerung dafür und programm
US11044392B2 (en) 2018-01-15 2021-06-22 Canon Kabushiki Kaisha Electronic apparatus, method for controlling same, enabling a user to easily identify the amount of zooming operation
CN113114945A (zh) * 2018-01-15 2021-07-13 佳能株式会社 电子装置、其控制方法和存储介质
CN110049232B (zh) * 2018-01-15 2022-03-29 佳能株式会社 电子装置、其控制方法和存储介质

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JP3880706B2 (ja) 2007-02-14
JPH11101932A (ja) 1999-04-13
DE19844423A1 (de) 1999-05-06
DE19844423B4 (de) 2009-04-16

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